﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp2
{
    class js
    {
       
       

        public double ff1(double r) {
            return  r * r * 3.14 ;
        }
        public double ff1(double c,double k) {
            return c * k;
        }
    }
}
